Forced convection from a horizontal ribbed rectangular base-plate penetrated by Tarrays of holes

A method has been employed to augment the forced convection to ambient air from a horizontal rectangular plate with its upper surface mounted with transverse A(to the mean airflow) rectangular ribs. which are uniformly spaced and heated. AThe enhancement has been achieved by drilling uniformly-spaced holes in the Abase plate between consecutive ribs. The steady-state effects of varying the Apenetration ratio, p, (i.e. of the total cross-sectional areas of the holes to Athe whole base-plate area between consecutive ribs), diameter of the hole, d, Aatio of channelʹs height to ribʹs common height, H/B, and Reynolds number, Rec, Aof the air-flow on the rate of forced convection from the rectangular plate Awere investigated experimentally for both laminar and turbulent flows over the Aribs. Heat-transfer measurements were obtained for the ranges: 500